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Q1. (a) Materials used for hull and machinery are subject to stress and strain in service.

Define EACH of the following:

(i) THREE types of stress;  (3)                               (ii) TWO types of strain (2)

(b) Describe the tests that may be carried out on steel to be used for ships side plating.(5)

Q2. With reference to control systems, explain EACH of the following:

a) Two-step action (2)

b) Offset (2)

c) Gain (2)

d) Proportional action (2)

e) Integral action (2)

Q3. (A) Sketch a muff type propeller shaft coupling (5)

(b) Describe how this type of coupling is connected (5)

Q5. Describe EACH of the following heat exchanger types, stating a suitable application for EACH type:

(a) parallel flow; (3)

(b) contra flow; (3)

(c) mixed flow. (4)

Q5. Describe, with the aid of a sketch, the operation of a biological sewage treatment plant (10)

Q6. With reference to a vapour compression refrigeration plant, explain the purpose of EACH of the following:

a) Room thermostat (2)

b) Expansion valve (2)

c) High pressure cut out (2)

d) Safety head (2)

e) Unloader (2)

Q6. With reference to the treatment of domestic water for potable use.

(a) describe the principle of operation of a steriliser that uses silver irons; (4)

(b) State the advantages of silver iron sterilisation over other methods; (2)

(c) State the inspections and maintenance that should be carried out on EACH of the following;

(i) Fresh water tanks (2)

(ii) calorifiers (2)

Q8. a) With reference to bunkering fuel oil, list the information to be supplied to the port authorities prior to commencement of bunker operations. (5)

b) With reference to the tank being filled, state the factors that govern the bunker loading rate. (4)

c) State a possible effect of a high bunker loading rate. (1)